Curved tubular profile
BACKGROUND OF THE INVENTION 
     The present invention relates to a profile with a tubular or other shape section having outer pairs of grooves arranged laterally on both sides of the central body bearing the profile. 
     Curved arches have been known which are made from a metal or other type of profile, or are extruded in light alloy, and which are intended for covering-structures which may be partially removed between the arches and which form either a fixed single vault along the entire length of the structure, or fixed and telescopic multiple vaults for covering a swimming pool or other location. These arches generally have a section in the shape of a U, of square or rectangular tubularity, with at least two pairs of grooves arranged one above the other along the entire extension of each arch. The grooves are arranged above a single one of the faces of the part of the central body bearing the profile, and distributed, opposite each other in pairs, on both sides of the vertical axis of symmetry of the profile. In this case, the entire profile is made from a single piece. 
     While suitable for its intended purpose, this conventional arrangement of pairs of grooves presents a drawback because, since the walls of the latter are a fair distance from the horizontal axis of symmetry of the part of the central body bearing the profile, this arrangement does not make it possible to rapidly and easily obtain (and without costly tools) arches with an elliptical shape or a similar shape comprising more than a single radius of curvature. This is because the walls of these grooves move closer together or warp and are deformed by flexion, this occurring all the more when they are at a distance form the horizontal axis of symmetry of the part of the profile forming its central bearing body. 
     Notwithstanding, the above discussed problem in the prior art, there is value in having arches with an elliptical shape and in obtaining a height enabling one to stand upright, all this, close to the edges of the structure on the ground, without having too great a height in the center of the arches forming the fixed or telescopic vaults of the structure. 
     This drawback, on the other hand, does not occur in the case where the pairs of grooves consist of a profile which is independent of the profile forming the central bearing body. This profile forming the grooves is stackable and is curved separately from the profile forming the central bearing body in a plurality corresponding to the number of walls of grooves required, as described in the document EP-A-0,224,290 (corresponding to U.S. Pat. No. 4,783,861, assigned to the assignee hereof, all of the contents of which are incorporated herein by reference). 
     In this case, the required distance between the grooves is easily obtained and perfectly controlled. However, there is then another major drawback with the vault structure of U.S. Pat. No. 4,783,861. This drawback consists of the fact that it is necessary to employ an expensive assembly operation, using screws or other means, for fixing each of the independently curved profiles which form, by being stacked on one another, the walls of the pairs of grooves onto a single one of the faces of the bearing profile. 
     As an example, in a structure which may be applied to covering a swimming pool, each half of a pair of grooves, of a pair of arches, is opposite, supports and guides its own sheet, preferably made from a flexible plastic material which is generally transparent. Together, between the arches, the sheets close off the bearing structure formed by the arches. 
     Each of these sheets slides along the entire length of the extension of the arches, being deformed according to the variable radius of curvature of the arches. 
     The sheets may be placed on top of one another between each pair of arches at arbitrary points in the extension of the arches in order to obtain partial uncovering between each pair of arches, which uncovering may, in the case of, for example, three pairs of grooves supporting three sheets between each arch, uncover up to approximately two-thirds of the part of the structure included between each pair of arches. 
     Therefore, in order that each of the sliding sheets may be maneuvered satisfactorily, it is essential that the walls of the grooves which receive them have a constant and uniform spacing, are not deformed or flexion and that this spacing is also the same after the necessary bending operation which enables the arches to be formed. 
     An object of the present invention then is to produce arches, intended for covering-structures which are partially removable between the arches, which have the shape of a half ellipse or a similar shape comprising more than a single radius of curvature, using a profile made from a single piece. It is still another object that these arches have outer fins forming pairs of grooves, without having to assemble these fins on a bearing profile, using screws or other means. The profiles being independent of said bearing profile, and independently bending in order to form these grooves. Still another object of this invention is that the walls of these grooves do not come close to each other and do not warp on bending. All of these features and objects, must be obtained easily, rapidly and without special or expensive tools. 
     SUMMARY OF THE INVENTION 
     In accordance with the present invention, these objects are achieved by virtue of a profile intended for covering structures which are partially removable between each of the pairs of arches thereof, by sliding flexible sheets, preferably made from a plastic material which is generally transparent wherein the profile is made from a single, bent metallic piece, comprising a tubular bearing body, bearing on each side, and perpendicularly to its vertical plane of symmetry, are fins arranged one above the other and together defining at least three grooves on each side of the bearing body. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective of a profile in accordance with the present invention, made from a single piece, with grooves arranged laterally with respect to its central bearing body and intended to form arches for a covering-structure which may be removed between each of the pair of arches thereof. 
     FIG. 2 is a diagrammatic view, in vertical cross section, of an arch of the present invention in conjunction with a swimming pool. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     In a preferred embodiment, the rectangular profile 1 in accordance with the present invention bears the grooves 2 and 2&#39;, which are formed by the fins 7 and 8 and 7&#39; and 8&#39;, respectively; the grooves 3 and 3 , formed by the fins 8 and 9 and 8&#39; and 9&#39;, respectively; and the grooves 4 and 4&#39; formed by the fins 9 and 10 and 9&#39; and 10&#39;, respectively. These grooves are distributed on either side laterally and perpendicularly to the central bearing body in the form of a box 5 and to the vertical axis of symmetry 6 of the rectangular tubular profile 1 on each side of the latter. In the vertical direction, the grooves are distributed uniformly on both sides of the horizontal axis of symmetry 11 of the rectangular tubular profile 1. 
     FIG. 2 shows an arch 12 used in a covering over a swimming pool 14. The arch 12 exhibits a hemi-elliptical shape, i.e. is bend according to several radii of curvature, and provides substantial headroom on each side of the swimming pool. 
     By bending the tubular profile 1, in the case of three pairs grooves 2, 3, 4 and 2&#39;, 3&#39;, 4&#39; (the middle 3 and 3&#39; being centered with respect to the horizontal axis of symmetry 11 of the tubular profile 1), and distributing the two other pairs of grooves 2 and 2&#39; and 4 and 4&#39;, one on each side of the grooves in the middle 3 and 3&#39;, it is necessary to take into consideration, for the bending operation and with respect to the risk of deformation and of the walls of the grooves coming closer together as a result of this operation, the distance of one groove and a half as the distance of their spacing from the horizontal axis of symmetry 11 of the tubular profile 1. It will be appreciated that this distance is small using this arrangement and in this case, it does not risk creating difficulties and deformations on bending. 
     This profile 1 as defined above, with its lateral fins forming the walls of the grooved, is made from a single piece or a single profile and makes it possible to produce arches which are bent in the shape of a semi-ellipse or in another similar shape, comprising more than one single radius of curvature, in one single bending operation while keeping the walls of the grooves parallel and preserving their initial spacing. 
     In accordance with the present invention, this arrangement makes it possible to produce a lighter profile with an inertia which is equal with respect to the solution of a bearing profile which is independent of the profile forming its grooves, to carry out only one bending operation and to not have to perform an operation of assembling various profiles forming the grooves on the bearing profile. 
     By virtue of the present invention, the distance of the various fins to the horizontal axis of symmetry 11, which remains a neutral axis, is reduced to a minimum value even after bending of the profile 1, a distance which is in any case less than the height of the central bearing body of the profile 1. This is in contrast to the prior art where the fins and the bearing part of the profile are one and the same profile, the said fins forming the pairs of grooves are located beyond its upper face which is the outer face of the bent bearing profile, thereby causing proportionately greater bending problems. 
     By virtue of the present invention, it is not, moreover, necessary to use the solution of fins formed by a profile which is stackable, independent of the bearing profile, (as in U.S. Pat. No. 4,783,861) which solution involves as many bending operations as there are profiles which are independent of one another, and also a long and expensive operation for assembling and fixing all the profile together. 
     It is possible to provide on one of the sides of the profile 1, in this case that which is the inner side after bending, a groove which permits the fixing or the anchoring of a seat, it being possible for this groove to penetrate the body of the profile up to the level of the fins 10 and 10&#39;. 
     While preferred embodiments have been shown and described, various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.